KERNEL: assertion (!sk->sk_forward_alloc) failed at net/* (again)

KERNEL: assertion (!sk->sk_forward_alloc) failed at net/* (again)

[Chris Boot]

Hi,

Sorry, no subject last time!

I've just seen the following assertions pop out of one of my servers  
running 2.6.16.9 with grsecurity. I've searched the archives of LKML  
and netdev and I've only found posts relating to 2.6.9, after which  
some related bugs were fixed... It looks like these bugs are related  
to e1000, which is the driver I'm using. The system was running 24  
days before these appeared and it's still running absolutely fine.

May 16 09:15:12 baldrick kernel: [6442250.504000] KERNEL: assertion (! 
sk->sk_forward_alloc) failed at net/core/stream.c (283)
May 16 09:15:12 baldrick kernel: [6442250.513000] KERNEL: assertion (! 
sk->sk_forward_alloc) failed at net/ipv4/af_inet.c (150)

baldrick bootc # ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on

Many thanks,
Chris

PS: I'm not subscribed to netdev.

-- 
Chris Boot
bootc@bootc.net
http://www.bootc.net/

Re: KERNEL: assertion (!sk->sk_forward_alloc) failed at net/* (again)

[Evgeniy Polyakov]

On Tue, May 16, 2006 at 11:38:38AM +0100, Chris Boot (bootc@bootc.net) wrote:
> May 16 09:15:12 baldrick kernel: [6442250.504000] KERNEL: assertion (! 
> sk->sk_forward_alloc) failed at net/core/stream.c (283)
> May 16 09:15:12 baldrick kernel: [6442250.513000] KERNEL: assertion (! 
> sk->sk_forward_alloc) failed at net/ipv4/af_inet.c (150)
> 
> tcp segmentation offload: on

This bug was fixed in .10 in stack and .12 in e1000 driver 
(probably unrelated to your problem, if you do not have packet plit
option enabled).

> Many thanks,
> Chris

-- 
	Evgeniy Polyakov

Re: KERNEL: assertion (!sk->sk_forward_alloc) failed at net/* (again)

[Chris Boot]

On 16 May 2006, at 11:51, Evgeniy Polyakov wrote:

> On Tue, May 16, 2006 at 11:38:38AM +0100, Chris Boot  
> (bootc@bootc.net) wrote:
>> May 16 09:15:12 baldrick kernel: [6442250.504000] KERNEL:  
>> assertion (!
>> sk->sk_forward_alloc) failed at net/core/stream.c (283)
>> May 16 09:15:12 baldrick kernel: [6442250.513000] KERNEL:  
>> assertion (!
>> sk->sk_forward_alloc) failed at net/ipv4/af_inet.c (150)
>>
>> tcp segmentation offload: on
>
> This bug was fixed in .10 in stack and .12 in e1000 driver
> (probably unrelated to your problem, if you do not have packet plit
> option enabled).

Aha, right. Well, I've got an upgrade to .16 ready to go and  
scheduled for Friday. What's interesting is that I never saw this  
problem come up before, and I've gone through each major interation  
of the kernel since 2.6.9...

Cheers,
Chris

-- 
Chris Boot
bootc@bootc.net
http://www.bootc.net/

Re: KERNEL: assertion (!sk->sk_forward_alloc) failed at net/* (again)

[Ingo Oeser]

Hi Chris,

here are some steps to narrow it down.

1. try the latest kernel first (2.6.16.16). This BUG should be fixed there.
2. try without grsecurity patch 
3. if it still persists:

	Please provide more information about your setup before
	submitting a bug.

	lspci -vvv and your .config would be the minimum
	some ethtool outputs (ethtool -k ethX) would help here.

4. If you like to have it resolved very fast, please try git-bisect.
    This can take a lot of time (several recompiles and reboots needed!).

Happy Bug hunting!

Regards

Ingo Oeser